refactor: improve router type safety and usage

- Add explicit Router type imports across views
- Replace $router type casting with proper typing
- Use $router.back() instead of $router.go(-1) for consistency
- Add proper route and router typings to components
- Clean up router navigation methods
- Fix router push/back method calls

This commit improves type safety and consistency in router usage across
the application's view components.

src/views/SeedBackupView.vue

@@ -62,7 +62,10 @@
               )
             "
           >
-            <font-awesome icon="copy" class="text-slate-400 fa-fw"></font-awesome>
+            <font-awesome
+              icon="copy"
+              class="text-slate-400 fa-fw"
+            ></font-awesome>
           </button>
           <span v-show="showCopiedSeed" class="text-sm text-green-500">
             Copied
@@ -79,7 +82,10 @@
               )
             "
           >
-            <font-awesome icon="copy" class="text-slate-400 fa-fw"></font-awesome>
+            <font-awesome
+              icon="copy"
+              class="text-slate-400 fa-fw"
+            ></font-awesome>
           </button>
           <span v-show="showCopiedDeri" class="text-sm text-green-500"
             >Copied</span
@@ -110,11 +116,11 @@ import {
   retrieveAccountCount,
   retrieveFullyDecryptedAccount,
 } from "../libs/util";
-
+import { Router } from "vue-router";
 @Component({ components: { QuickNav } })
 export default class SeedBackupView extends Vue {
   $notify!: (notification: NotificationIface, timeout?: number) => void;
-
+  $router!: Router;
   activeAccount: Account | null | undefined = null;
   numAccounts = 0;
   showCopiedDeri = false;